Quarterly report pursuant to Section 13 or 15(d)

Repurchase of Common Stock - Additional Information (Detail)

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Repurchase of Common Stock - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Aug. 01, 2013
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]      
Common stock authorized to be repurchased over the next 12 months $ 25,000,000    
Shares repurchased 233,400   1,359,106
Average price per share $ 5.74   $ 6.00
Common stock repurchased, value $ 25,314,000 $ 23,975,000 $ 8,200,000
Shares repurchased     1,125,706